Added auto snippet for webserver injection

tests/unit/roles/sys-srv-web-inj-compose/filter_plugins/test_inj_snippets.py

@@ -0,0 +1,106 @@
+# tests/unit/roles/sys-srv-web-inj-compose/filter_plugins/test_inj_snippets.py
+"""
+Unit tests for roles/sys-srv-web-inj-compose/filter_plugins/inj_snippets.py
+
+- Uses tempfile.TemporaryDirectory for an isolated roles/ tree.
+- Loads inj_snippets.py by absolute path (no sys.path issues).
+- Monkey-patches inj_snippets._ROLES_DIR to the temp roles/ path.
+- Calls the filter function via the loaded module to avoid method-binding.
+"""
+
+import os
+import sys
+import unittest
+import tempfile
+import importlib.util
+
+
+class TestInjSnippets(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        # Find repo root by locating inj_snippets.py upwards from this file
+        cls.test_dir = os.path.dirname(__file__)
+        root = cls.test_dir
+        inj_rel = os.path.join(
+            "roles", "sys-srv-web-inj-compose", "filter_plugins", "inj_snippets.py"
+        )
+
+        while True:
+            candidate = os.path.join(root, inj_rel)
+            if os.path.isfile(candidate):
+                cls.repo_root = root
+                cls.inj_snippets_path = candidate
+                break
+            parent = os.path.dirname(root)
+            if parent == root:
+                raise RuntimeError(f"Could not locate {inj_rel} above {cls.test_dir}")
+            root = parent
+
+        # Create isolated temporary roles tree
+        cls.tmp = tempfile.TemporaryDirectory(prefix="inj-snippets-test-")
+        cls.roles_dir = os.path.join(cls.tmp.name, "roles")
+        os.makedirs(cls.roles_dir, exist_ok=True)
+
+        # Dynamically load inj_snippets by file path
+        spec = importlib.util.spec_from_file_location("inj_snippets", cls.inj_snippets_path)
+        if spec is None or spec.loader is None:
+            raise RuntimeError("Failed to create import spec for inj_snippets.py")
+        module = importlib.util.module_from_spec(spec)
+        spec.loader.exec_module(module)
+
+        # Point the module to our temp roles/ directory
+        module._ROLES_DIR = cls.roles_dir
+
+        # Keep the loaded module for calls
+        cls.mod = module
+
+        # Mock feature names
+        cls.feature_head_only = "zz_headonly"
+        cls.feature_body_only = "zz_bodyonly"
+        cls.feature_both = "zz_both"
+        cls.feature_missing = "zz_missing"
+
+        # Create mock roles and snippet files
+        cls._mkrole(cls.feature_head_only, head=True, body=False)
+        cls._mkrole(cls.feature_body_only, head=False, body=True)
+        cls._mkrole(cls.feature_both, head=True, body=True)
+
+    @classmethod
+    def _mkrole(cls, feature, head=False, body=False):
+        role_dir = os.path.join(cls.roles_dir, f"sys-srv-web-inj-{feature}")
+        tmpl_dir = os.path.join(role_dir, "templates")
+        os.makedirs(tmpl_dir, exist_ok=True)
+        if head:
+            with open(os.path.join(tmpl_dir, "head_sub.j2"), "w", encoding="utf-8") as f:
+                f.write("<!-- head test -->\n")
+        if body:
+            with open(os.path.join(tmpl_dir, "body_sub.j2"), "w", encoding="utf-8") as f:
+                f.write("<!-- body test -->\n")
+
+    @classmethod
+    def tearDownClass(cls):
+        cls.tmp.cleanup()
+
+    def test_head_features_filter(self):
+        features = [self.feature_head_only, self.feature_both, self.feature_body_only]
+        result = self.mod.inj_features_filter(features, kind="head")
+        self.assertEqual(result, [self.feature_head_only, self.feature_both])
+
+    def test_body_features_filter(self):
+        features = [self.feature_head_only, self.feature_both, self.feature_body_only]
+        result = self.mod.inj_features_filter(features, kind="body")
+        self.assertEqual(result, [self.feature_both, self.feature_body_only])
+
+    def test_raises_when_role_dir_missing(self):
+        with self.assertRaises(FileNotFoundError):
+            self.mod.inj_features_filter([self.feature_missing], kind="head")
+        with self.assertRaises(FileNotFoundError):
+            self.mod.inj_features_filter([self.feature_missing], kind="body")
+
+    def test_non_list_input_returns_empty(self):
+        self.assertEqual(self.mod.inj_features_filter("not-a-list", kind="head"), [])
+        self.assertEqual(self.mod.inj_features_filter(None, kind="body"), [])
+
+
+if __name__ == "__main__":
+    unittest.main()